That Time of year

Just over a year ago I posted here that I had received two adverts from  car insurance companies telling me that my car insurance was due for renewal and had I considered moving over to them, when I don't have a car, have never taken a driving test, and last  attempted driving lessons in 1974,

It has happened again this year, albeit a week apart this time, plus a third advert for car insurance not specifically saying my current insuance.  So, why now?